The typical start up sequence for a hot surface ignition system is:
A) Combustion blower prepurge, igniter energized after a delay, gas valve energized after a delay, flames sensed, indoor blower energized after time delay.
B) Combustion blower, indoor blower, igniter, and gas valve all energized simultaneously.
C) Gas valve and igniter energized, flames sensed, combustion blower and indoor blower energized after time delay.
D) Combustion blower energized, igniter energized and gas valve energized, flames sensed, indoor blower energized after time delay.
Question 2
A big reason that communicating systems improve efficiency is:
A) They monitor and correct power factor.
B) They can make intelligent decisions based on actual operating conditions.
C) They switch faster than relay systems.
D) Relays consume large amounts of power in conventional systems.
The central nervous system
Ivanpah Solar Electric Generating System
The lymphatic system.
Typical Reverse Osmosis Filter Setup
A typical clean-in-place system
The lacO region O1 containing an inverted repeat sequence